4:11God instructs you regarding your children: The male receives the equivalent of the share of two females. If they are daughters, more than two, they get two-thirds of what he leaves. If there is only one, she gets one-half. As for the parents, each gets one-sixth of what he leaves, if he had children. If he had no children, and his parents inherit from him, his mother gets one-third. If he has siblings, his mother gets one-sixth. After fulfilling any bequest and paying off debts. Your parents and your children—you do not know which are closer to you in welfare. This is God's Law. God is Knowing and Judicious.

4:23Forbidden for you are your mothers, your daughters, your sisters, your paternal aunts, your maternal aunts, your brother's daughters, your sister's daughters, your foster-mothers who nursed you, your sisters through nursing, your wives' mothers, and your stepdaughters in your guardianship—born of wives you have gone into—but if you have not gone into them, there is no blame on you. And the wives of your genetic sons, and marrying two sisters simultaneously. Except what is past. God is Oft-Forgiving, Most Merciful.